(image from handresearch.com. I searched ‘literacy’ and ‘ratio.’ I thought I would share).

I came across the term “ratio” for learning in TLAC 2.0. Doug Lemov credits hearing the term first from Dave Levin, co-founder of Kipp. This is the earliest mentionfrom him I can find: KIPP Blog.

Ratio, in this sense, refers to the amount of “cognitive heavy lifting” every learner has to do in class. Low ratio activities include teaching from the front; “one person talks while everyone else listens”; video; silent reading.